The document that you sent is related to how to enable and disable processors in multiple socket boards. It means server boards capable of supporting 2 or more processors (CPUs) and not processor Cores. (CPU Cores).

It is possible to turn off some of the Cores from the BIOS and the power consumption would decrease a little a bit. Cache memory and other features are shared by all the Cores so the active Cores would take advantage of the free memory.